/Engine/Source/Editor/Sequencer/Public/ISequencerTrackEditor.h
struct FSequencerDragDropParams
FFrameNumber
FrameNumber
The frame number that this drop event is being dropped at
TRange<FFrameN...
FrameRange
The frame range that this drop event is being dropped at
int32
RowIndex
The row index to drop onto
FGuid
TargetObjectGuid
The object guid this asset is dropped onto, if applicable
TWeakObjectPtr<...
Track
The track that is receiving this drop event